NPPES file of Aug 9, 2026

Internal Medicine Physician in California

17,696 NPPES records list internal medicine physician with a practice address in California, 45 per 100,000 residents, the 17th highest rate of 51. Los Angeles and San Francisco have the most; each record links to the provider's NPI and the California license search. Page 197 of 354.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207R00000X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Los Angeles has the most, 1,423

  1. Los Angeles1,423
  2. San Francisco1,318
  3. San Diego961
  4. Sacramento601
  5. Oakland432

Internal Medicine Physician records in California

  1. Natasha Maqsood, MDRed Bluff, CA 960801518459858
  2. Teresita Maqueda, M.D.Burbank, CA 915021932138013
  3. Carolyn Mar, MDSan Francisco, CA 941151649358250
  4. Jimmie Mar, D.O.San Jose, CA 951101649705567
  5. Kelvin Mar-Tang, MDNapa, CA 945581679651491
  6. Roger Mar-Tang, M.D.Folsom, CA 956301851375307
  7. Maria Lourdes Mara, M.D.San Diego, CA 921391376515924
  8. Ryan Marais, MDLoma Linda, CA 923541922688282
  9. Naveen Maramreddy, M.D.Truckee, CA 961611134411267
  10. Neeraja Maramreddy, MDMartinez, CA 945531093893109
  11. Michael Marchiano, MDHayward, CA 945451275636276
  12. Roman MarciniakSan Diego, CA 921031326579210
  13. Noachim Marco, M.D.Reseda, CA 913351366848335
  14. Kirsten Marcus, M.D.San Francisco, CA 941221992995435
  15. Paul MarcusPalo Alto, CA 943041386900959
  16. Joseph Mardanzai, MDSan Ramon, CA 945821043220031
  17. Lisa Marelich, MDElk Grove, CA 957581417035130
  18. Emily Margolin, MDSan Diego, CA 921031245867894
  19. David Margolis, M.D.Encinitas, CA 920241073716221
  20. Murray Margolis, M.D.Mission Viejo, CA 926911457338857
  21. Peter Margolis, M.D.Thousand Oaks, CA 913611306876164
  22. Paul MarguglioHealdsburg, CA 954481023045861
  23. S Joseph Marianayagam, MDLancaster, CA 935341679673776
  24. Larry Marianella, M.D.Santa Rosa, CA 954051144257486
  25. Jonathan MarianoPanorama City, CA 914021982309423
  26. Roberto Mariano, M.D.N Hollywood, CA 916071992848980
  27. Mark Marin, MDSan Francisco, CA 941111144375668
  28. John Marino, M.D.San Diego, CA 921201780667030
  29. Mark MarinoCarlsbad, CA 920091508386376
  30. Daniela MaristanySan Francisco, CA 941151760915037
  31. Kiran Mariwalla, MDSolvang, CA 934631558471433
  32. Curtis Mark, MDMilpitas, CA 950351205912136
  33. Denise Mark, M.D.Carmel, CA 939231558437004
  34. Ester Mark, M.D.Laguna Hills, CA 926531770683468
  35. Ani Markarian, M.D.Los Angeles, CA 900271457305435
  36. Vachik Markarian, MDPanorama City, CA 914021659423010
  37. Marko Markov, M.D.Escondido, CA 920291821004516
  38. Jessie Markovits, MDStanford, CA 943051831432764
  39. Stuart Markovitz, MDMountain View, CA 940401073520219
  40. George Marks, MDLos Angeles, CA 900291578589602
  41. Jennifer MarksLos Angeles, CA 900331033288667
  42. Katie Marks, M.D.Culver City, CA 902321154596047
  43. Zachary Marks, M.D.Los Angeles, CA 900481265819445
  44. Albert Marland, M.D.Los Gatos, CA 950321336184589
  45. Ruth Marlin, MDSan Francisco, CA 941171720114390
  46. Anita Marlowe, MDSan Diego, CA 921201669520482
  47. Diana Marquardt, MDSan Diego, CA 921051114909454
  48. Francisco Marquez, M.D.San Marcos, CA 920781316190747
  49. Frank Marquez, MDSylmar, CA 913421922291582
  50. Georgina Marquez, DVMFountain Valley, CA 927081194246934

Source: CMS NPPES, primary taxonomy 207R00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 17 of 51 per resident

  1. New Jersey50
  2. New Hampshire48
  3. Minnesota46
  4. California45
  5. Florida45
  6. Ohio45
  7. 50 states and D.C.44

Source: CMS NPPES, primary taxonomy 207R00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

79.5% of these records appear in a Medicare file, against 78.7% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. California79.5%
  2. United States78.7%

Internal Medicine Physician records in California, measured

  • In a Medicare file14,068 of 17,696 · 79.5% here, 78.7% nationally
  • In the CMS Doctors and Clinicians file11,077 · 62.6% here, 61.4% nationally
  • Not updated in five years or more10,832 · 61.2% here, 55.4% nationally
  • Median graduation year2004 · the 11,065 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207R00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

17,696 NPPES records list internal medicine physician (207R00000X) as their primary taxonomy with a practice address in California: 45 per 100,000 residents against 44 nationally (50 states and D.C.). Los Angeles has 1,423 of them (8%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. New York12,067
  2. Florida10,151
  3. Texas9,175
  4. Pennsylvania7,300

States with a similar rate per 100,000

  1. Minnesota45.9
  2. Ohio44.8
  3. New Hampshire48.0
  4. Maine42.8

The largest states

  1. New York12,067
  2. Florida10,151
  3. Texas9,175
  4. Pennsylvania7,300
  5. Illinois7,238

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.